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Designing whispering gallery modes via transformation optics

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Title
Designing whispering gallery modes via transformation optics
Author(s)
Yushin Kim; Soo-Young Lee; Jung-Wan Ryu; Inbo Kim; Jae-Hyung Han; Heung-Sik Tae; Muhan Choi; Bumki Min
Publication Date
2016-09
Journal
NATURE PHOTONICS, v.10, no.10, pp.647 - 652
Publisher
NATURE PUBLISHING GROUP
Abstract
In dielectric cavities with a rotational symmetry, whispering gallery modes (WGMs) with an extremely long lifetime (that is, a very high Q factor) can be formed by total internal reflection of light around the rim of the cavities. The ultrahigh Q factor of WGMs has enabled a variety of impressive photonic systems, such as ultralow threshold microlasers1–3, biosensors with unprecedented sensitivity4,5 and cavity optomechanical devices6. However, the isotropic emission of WGMs, which is due to the rotational symmetry, is a serious drawback in applications that require directional light sources. Considerable efforts have thus been devoted to achieving directional emission by intentionally breaking the rotational symmetry7–9. However, all of the methods proposed so far have suffered from substantial Q-spoiling. Here, we show how the mode properties of dielectric whispering gallery cavities, such as the Q factor and emission directionality, can be tailored at will using transformation optics. The proposed scheme will open a new horizon of applications beyond the conventional WGMs. © 2016 Macmillan Publishers Limited, part of Springer Nature.
URI
https://pr.ibs.re.kr/handle/8788114/2868
ISSN
1749-4885
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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